Which of the following is an example of the distributive property?

a. 3(10 + 5) = 3(5 + 10)
b. 3(10 + 5) = (10 + 5)3
c. 3(10 + 5) = 30 + 15
d. 3(10 + 5) = 3(15)

i need some , i really don't remember this lesson, though i do think it is either a or b.

i did try to do the math myself and rounded it up to those two, but in the end they're both 15. though a would be what i think it is, seeing as the 3 is in front, not in the back.

in advance.